Adjustable Ventilation System

1. An electronic device, comprising: a case comprising a vent, the vent defining a plurality of holes; and an adjusting plate movably mounted on the case and aligning with the vent, the adjusting plate defining a plurality of holes, wherein the adjusting plate is movable relative to the vent such that at a position the plurality of holes of the adjusting plate does not aligns with the plurality of holes of the vent and the adjusting plate totally blocks the plurality of holes of the vent.

2. The electronic device as claimed in claim 1 , wherein the case comprises at least a fixing element to retain the adjusting plate on to the case when the adjusting plate is moving relative to the vent.

3. The electronic device as claimed in claim 2 , wherein the fixing element protrudes from the case to fix a rim of the adjusting plate when the adjusting plate is moving relative to the vent.

4. The electronic device as claimed in claim 3 , wherein the fixing element forms a chute between the fixing element and the case to receive the adjusting plate when the adjusting plate is moving relative to the vent.

5. The electronic device as claimed in claim 1 , wherein the adjusting plate is round-shaped.

6. The electronic device as claimed in claim 1 , wherein the plurality of holes of the vent and the plurality of holes of the adjusting plate are arranged in a matrix.

7. The electronic device as claimed in claim 1 , wherein a fan is installed on the case in corresponding to the vent.

8. The electronic device as claimed in claim 7 , wherein the adjusting plate totally blocks the plurality of holes of the vent when the fan is disabled.

9. The electronic device as claimed in claim 1 , wherein volume of air flow though each of the plurality of holes of the vent is adjusted when the adjusting plate is moved relative to the vent.